Write a C++ program to calculate the factorial of a number using recursion.

 #include <iostream>

using namespace std;

int factorial(int n) {

    if (n == 0) {

        return 1;

    }

    return n * factorial(n - 1);

}

int main() {

    int number = 5;

    int result = factorial(number);

    cout << "Factorial of " << number << " is: " << result << endl;

    return 0;

}